Missing Favourite Previews after Migration to AC23?

Are the preview images of your window or door favourites missing after upgrading a project to ARCHICAD 23?

It’s likely that the marker is missing.

Select your missing window favourites from the Favourites Pallet by holding down either the CMD/CTRL key and selecting them individually or use the shift key to select a range. Once selected, right click and then choose Edit from the context menu.